Effect of 5‐bromodeoxyuridine on incorporation of RNA precursors in sea urchin embryos

Abstract
Exposure of early sea urchin embryos to 5‐bromodeoxyuridine (at concentrations up to 100 μg per ml) severely decreases the uptake of exogenous 3H‐uridine into RNA. However, the actual gross rate of DNA or RNA synthesis in these embryos appears not to be affected by the presence of 5‐bromodeoxyuridine.